Europol’s European Cybercrime Centre has worked with Microsoft to disrupt Lumma Stealer (“Lumma”), the world’s most significant infostealer threat.
This joint operation targeted the sophisticated ecosystem that allowed criminals to exploit stolen information on a massive scale. Europol coordinated with law enforcement in Europe to ensure action was taken, leveraging intelligence provided by Microsoft. Between 16 March and 16 May 2025, Microsoft identified over 394 000 Windows computers globally infected by the Lumma malware. In a coordinated follow-up operation this week, Microsoft’s Digital Crimes Unit (DCU), Europol, and international partners have disrupted Lumma’s technical infrastructure, cutting off communications between the malicious tool and victims.
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Source: Europol
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